acinclude.m4 (GLIBCPP_CHECK_COMPLEX_MATH_SUPP): Just test for signbit and __signbit directly.

2002-03-22  Benjamin Kosnik  <bkoz@redhat.com>

	* acinclude.m4 (GLIBCPP_CHECK_COMPLEX_MATH_SUPP): Just test for
	signbit and __signbit directly.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* libmath/Makefile.am: Simplify.
	* libmath/Makefile.in: Regenerate.
	* include/c_std/std_cmath.h: Update paths for include of cmath.tcc.

	* include/Makefile.am: Clean up handling of extra "C" header files.
	Add hooks for "C" compatibility headers.
	* include/Makefile.in: Regenerate.

	* include/c/*: Formatting tweaks, cleanups.
	* include/c_std/*: Same.

From-SVN: r51220